Process of dyeing



Patented Dec. 2, 1924.

UNITED STATES PATENT OFFICE.

PAUL BABE, OF LEVERKUSEN, NEAR COLOGNE-ON-THE-RHINE, GERMANY, ASSIGNOB 'IO FARBENFABBIKEN VO'RM. FRIEDR. BAYER AND 00., F LEVERKUSEN, NEAR COLOGNE-ON-THE-RHI'NE, GERMANY.

PROCESS OF DYEING.

No Drawing.

T0 (ZZZ whom it may concern:

Be it known that 1, PAUL RARE, a citizen of Germany, res ding at Leverkusen, near Cologne-on-the-Rhine, in the State of Prussia, Germany, have invented new and useful Improvements in Processes of Dyeing, of which the following is a specification.

It is well known that acidyl celluloses have only a small absorptive power for dyestuffs. Attempts have, therefore not been lacking to remedy this defect.

The noteworthy fact has now been established, that pyridine and its homologues are suitable in quite a peculiar degree as additions in the dyeing of acidyl cellulose,

e. g. acetate silk, films, etc., or their transformation products when dyes of a basic character are employed.

In order to illustrate the new process more fully, the following examples are given Ewample 1.0.1 gram of diamantfuchsine is dissolved in 100 cubic centimeters of water and 1 gram of pyridine is added.

After proper wetting of the cellulose acetate material the dyeing is carried out at a temperature of about 60-70 (3., the time required being about minutes at the above temperature. It will be advantageous after 30 dyeing to remove any adhering pyridine by washing with acetic or formic acid before drying the dyed cellulose acetate.

Application filed April 11, 1924. Serial No. 705,934.

Example 2.0.203 gram of China green are dissolved in 100 cubic centimeters of water and 1 gram of pyridine is added. Dyeing is performed as under 1.

Other dyestuffs or their salts, as for instance, methylene blue, rhoduline, heliothrop B may be used.

Other pyridines can be used, such as methylpyridine, aminopyridine, etc.

1. Process for dyeing acidyl celluloses or their transformation products, which process consists in addinga pyridine compound in the dyeing, substantially as. described.

2. Process for dyeing acidyl celluloses or their transformation products, which process consists in adding pyridine in the dyeing, substantially as described.

8. A dyeing composition comprising a dye and a pyridine compound, substantially as described.

4. A dyeing composition comprising a dye and pyridine, substantially as described.

5. An acidyl cellulose fabric treated with a dye and a pyridine compound, substantially as described.

6. An acidyl cellulose fabric treated with a dye and pyridine, substantially as described.

In testimony whereof I have hereunto set my hand.

PAUL BABE. 

